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Selection guidelines for different capping devices under various operating conditions are listed in table 1. However, these guidelines cannot substitute for testing a shield or seal in its application. For additional information, refer to Sealing solutions.

The seals, which are fitted in a recess on the outer ring, make good, positive contact with the recess, without deforming the outer ring. The capping devices are available as:

Shields (designation suffix Z)

are primarily intended for applications where the inner ring rotates

are fitted in the outer ring and form a narrow gap with the inner ring

are made of sheet steel

are available as standard with an extension in the shield bore (fig. 2), expect some sizes without extension

make positive contact with a recess in the inner ring shoulder for good sealing effectiveness

are available for 60, 62 and 63 series bearings in three RST designs, depending on the size

Contact seals (designation suffixes RSH, RSH2, RS1 or RS2)

are made of sheet steel reinforced

NBR

FKM (designation suffix RS2 or RSH2, available on request)

are available in different designs depending on the bearing they are used with:

for 60, 62 and 63 series bearings in two RSH designs (fig. 6), depending on the size

for RS1 designs, with sealing either against the inner ring shoulder or against a recess in the inner ring side face (fig. 7); the relevant design is determined by dimension d1 or d2 in the product table.

WARNING

Seals made of FKM (fluoro rubber) exposed to an open flame or temperatures above 300 °C (570 °F) are a health and environmental hazard! They remain dangerous even after they have cooled.

On request, bearings can be supplied with the following special greases:

high temperature grease GJN

wide temperature range grease HT or WT

wide temperature range and low-noise grease LHT23

low temperature grease LT

The technical specifications of the various greases are listed in table 3.

The standard grease is not identified in the bearing designation (no designation suffix). Special greases are indicated by the corresponding grease suffix. Check availability of bearings with special grease prior to ordering.

Grease life for capped bearings

is presented as L10, i.e. the time period at the end of which 90% of the bearings are still reliably lubricated (diagram 1)

When capped bearings must operate under certain extreme conditions, such as very high speeds or high temperatures, grease may appear on the capping diameter. For bearing arrangements where this would be detrimental, appropriate actions could be taken. For additional information, contact the SKF application engineering service.

SKF single row deep groove ball bearings are fitted with one of the cages shown in table 5. The standard stamped steel cage is not identified in the bearing designation. If non-standard cages are required, check availability prior to ordering.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages and Cage materials.